| Electronics > Repair |
| Siglent SDS1202x-E fried FAN driver transistor - SOLVED - |
| << < (5/6) > >> |
| tppc:
--- Quote from: tautech on June 22, 2024, 08:24:58 pm --- --- Quote from: tppc on June 22, 2024, 12:29:06 pm --- --- Quote from: tautech on January 29, 2024, 08:10:47 pm ---Think it's just A2R..... https://www.aliexpress.com/item/32330365420.html --- End quote --- Hi everyone, I could not find any result for the codes A2RX or A2R. A2 could be almost anything from diodes, mosfets to voltage regulators... Can anyone have access to the SDS1202X-E parts list and check the reference for Q34? --- End quote --- Schematics are not available. I've done the work for you and given you a link to the transistor. I have a SDS1202X-E warranty claim PCB should you need other parts identified. --- End quote --- Thanks for your help. however, The aliexpress link does not give the transistor reference and the product is not available. :( |
| tppc:
--- Quote from: fzabkar on June 22, 2024, 10:59:31 pm ---Is Q34 the pass transistor in a linear -10V AVEE supply? --- End quote --- no, the -10V AVEE commes from the PSU board (SMPS, not linear) Q34 is used as a swich to power the fan from GND to -10V AVEE |
| tppc:
--- Quote from: CharlotteSwiss on June 22, 2024, 10:15:45 pm ---Q34 is used to have -10Vdc for the analogue circuits (Attachment Link) --- End quote --- Yes, it is a test point on the main board. -10V AVEE can also be probed on pin 9 of the power cable plug |
| fzabkar:
--- Quote from: tppc on June 22, 2024, 11:49:41 pm --- --- Quote from: fzabkar on June 22, 2024, 10:59:31 pm ---Is Q34 the pass transistor in a linear -10V AVEE supply? --- End quote --- no, the -10V AVEE commes from the PSU board (SMPS, not linear) Q34 is used as a swich to power the fan from GND to -10V AVEE --- End quote --- Then how can removing the transistor that switches the fan prevent the -10V supply from working properly??? --- Quote from: tppc ---I desoldered the broken transistor but now the scope does not power up anymore :palm: All PSU voltages OK except -VEE which reads -8.8V instead of -10V. --- End quote --- Or are you just saying that you have now encountered a different fault unrelated to the first? I'm confused ... |
| tppc:
--- Quote from: fzabkar on June 23, 2024, 12:20:02 am --- Or are you just saying that you have now encountered a different fault unrelated to the first? I'm confused ... --- End quote --- Yes, I think it is unrelated. Maybe I broke somthing while disconnecting the PSU 12 pins connector. I need to take out the main board and inspect it carefully. (which I did not do yet) |
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